Principal Backend Engineer
Flagship Pioneering · Cambridge, MA USA
About this role
**Extuitive — Principal Backend Engineer (Cambridge, MA)** **About Extuitive** Extuitive is a Flagship Pioneering-backed startup reimagining product innovation for the AI era. Our mission is to revolutionize go-to-market for planning and execution for the agentic age. We operate like a special ops unit—fast-moving, data-driven, and relentlessly focused on impact. **The Role** As a **Principal Backend Engineer**, you’ll architect, build, and scale the core backend systems powering our agentic platform. You’ll drive high-throughput services, resilient data pipelines, real-time agent clouds, and integrations with mission-critical third-party providers. You’ll translate complex requirements into robust, elegant systems that support rapid growth, and help evolve our platform architecture to maintain security and reliability as we scale. **Key Responsibilities** - **All things AI agents:** Work with your team on harness selection, prompt optimization, and evaluation systems to deliver best-in-class agent experiences. - **Own core backend systems:** Design, build, and maintain scalable services, APIs, and platform infrastructure; ensure reliability, observability, and maintainability. - **Build and maintain large-scale data pipelines:** Architect and operate high-volume, resilient pipelines for ingestion, transformation, and analytics. - **Lead third-party integrations:** Build and maintain vendor integrations with a focus on reliability, observability, and long-term maintainability. - **Influence architecture & best practices:** Shape backend architecture, coding standards, testing frameworks, CI/CD, and operational excellence. - **Wear multiple hats:** Support DevOps, troubleshooting, or other platform needs when necessary. **Professional Experience & Qualifications** - **8+ years** of backend engineering experience. - Experience with high-velocity agentic coding under **strict security requirements**. - Bachelor’s degree in Computer Science/Software Engineering (or equivalent practical experience). - Strong expertise in backend languages/frameworks (**Node.js/TypeScript, Go, Python,** or similar). - Experience designing **scalable distributed systems**, **microservices**, and **event-driven architectures**. - Deep experience with third-party integrations: **REST/GraphQL APIs**, **webhooks**, and **rate-limited services**. - Proficiency with **SQL/NoSQL databases**, data pipelines, and performance optimization. - Familiarity with **AWS/GCP** and containerized/deployed systems (**Docker, Kubernetes**). - Strong testing, **CI/CD**, and observability practices. - Comfortable working in a fast-paced, evolving environment with minimal oversight. **Nice to Have** - Experience building and shipping features quickly in early-stage startups. - Exposure to multiple backend domains (analytics, payments, notifications, workflow orchestration). - Hands-on experience with **serverless** or **edge** architectures. - Familiarity with low-friction integrations with third-party tools and SaaS platforms. - Track record scaling systems from MVP to production-ready services. - Comfort with ambiguity and trade-offs between speed, quality, and maintainability. **Compensation** Salary range: **$188,000 – $258,500**. Compensation depends on qualifications, skills, competencies, and experience. Extuitive currently offers healthcare coverage, annual incentive program, retirement benefits, and other benefits. **Equal Opportunity** Extuitive is an equal opportuni
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